摘要
对西南桦25个种源380个家系5个月生的苗木进行了苗期生长比较试验。结果表明:不同种源间苗期生长差异极显著,其中云南元阳、广西凌云、云南凤庆和广西靖西4个种源极显著地优于其它20个种源,为最优组;云南双江、云南瑞丽、云南勐腊、广西田林和云南澜沧5个种源为次优组;云南西畴、广西大青山、云南腾冲、云南景洪、广西天峨和广西凌云6个种源的平均苗高生长最低,显著地低于其他种源为最劣组;其余10个种源为中等组。家系间苗木生长表现达极显著差异水平,以1/5入选率筛选获得76个优良家系苗木,其苗木平均高均大于30cm,而苗木平均高低于15cm的48个家系定为劣等家系,占全部家系的12.6%。通过对76个优良家系及48个劣等家系在种源中分布情况看出,除少数种源中没有同时存在优良和劣等家系外,其它大多数种源中都同时含有优良和劣等家系,说明在苗期开展西南桦家系比较选择试验比开展种源选择尤为重要。
A total of 380 families representing 25 provenances of five- month--old grownseedlingsofBetula alnoideswere compared tocarry outseedling test. The results indicated that highly significant differences were shown among provenances, with the superior（YunnanYuanyang, GuangxiLingyun, Yunnan Fengqingand Guangxi Jingxi）, less superior （YunnanShuangjiang, Yunnan Ruili, Yunnan Mengla, Guangxi Tianlinand Yunnan Lancang）, inferior groupof which the lowest averageseedling height（Yunnan Xichou, Guangxi Daqingshan, Yunnan Tengchong, Yunnan JinghongGuangxi Tianeand GuangxiLingyun）and theleftprovenancesasintermediate group. Highly significant differ- ences were also shown among families, and 76 families （20.0%） were selected out as superior group （mean height more than 30cm） while 48 families （12.6%） were inferior with mean height less than 15cm. Most of the provenances contained both superior and inferior families, indicating the necessity of progeny test in addition to provenance trials.
出处
《绿色科技》
2016年第15期27-31,共5页
Journal of Green Science and Technology
关键词
西南桦
种源
家系
苗期试验
Betula alnoides
provenance/family
seedling test
